Download the image and check the md5sum
http://distro.ibiblio.org/pub/linux/dis ... 6.0.4-usb/
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md5sum refracta-604_usb.img
881db5d3a2907a210063e823f683b0ff refracta-604_usb.img
Transfer the image to a usb thumb drive that is at least 1GB.
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dd if=refracta-604_usb.img of=/dev/sdX
Reboot. (you may need to set your bios to boot from usb.)
If your usb drive is larger than 1GB, you could create a second partition and label it home-rw or live-rw to be able to boot into persistent mode. (I can write more about this later.)
Install Refracta
Install refracta from usb the same way you'd install from CD. Installers are listed in the menu under System. Pick one and run it. Refracta Installer is simple to use and puts everything in one partition. Refracta Installer New gives you more choices, such as multiple partitions or encrypted partitions.
Changing the system on the usb stick
Configure your installed system the way you want it.
Create a snapshot.
Mount the iso file
Plug the stick in and mount it.
Copy live/boot/ from the stick to a safe temporary location on your installed system.
Delete the live folder on the mounted stick.
Copy the live folder from the mounted iso onto the stick.
Copy the saved boot folder back into the new live folder on the mounted stick.
Done.
The current live folder is around 640MB, and the entire image is 985MB, so you have some room to install quite a bit of software before you would need to make the partition bigger.